McFarland didn't travel with the team for Friday's preseason game against the Panthers due to an unspecified injury, Brooke Pryor of ESPN.com reports.
McFarland was relatively inefficient in the Steelers' exhibition win over the Lions with six carries for 11 yards along with two receptions for 21 yards, and he remained in Pittsburgh for the preseason finale. Assuming the 2020 fourth-rounder remains on the roster to begin the regular season, it's not yet clear whether his injury will limit his availability for the team's Week 1 matchup against the Bills.